Your behaviour is more important a protection against threats than simply installing protective software.
Objective-See
Even if you don’t like the idea of apps blocking what they deem to be suspicious events, TaskExplorer gives you the ability to check out what is going on, and what looks suspicious.
For my money, at the moment, Objective-See’s free products are targeted at the real threats, and don’t screw OS X up or around.
The Eclectic Light Company 